typeof, instanceof

typeof "string"	// "string"
typeof 123		// "number"
typeof 1.2		// "number"
typeof 1/0		// NaN		?? typeof 할때 계산은 미리 하고 진행하자. 이상하다.
typeof (1/0)		// "number"		??
typeof 0/1		// NaN		??
typeof (0/1)		// "number"		??

1/0			// Infinity
typeof Infinity	// "number"
typeof false		// "boolean"

typeof afssddfd	// "undefined"
typeof null		// "object"		!!!
typeof []		// "object"
typeof new Array("12")	// "object"
typeof {}		// "object"
typeof new Object()	// "object"

typeof function(){}		// "function"
typeof alert			// "function"

1/0			// Infinity
1-"a"			// NaN
1-"12"			// -11

//

[1,2] instanceof Object
[1,2] instanceof Array

new String("as") instanceof Object
new String("as") instanceof String
new Boolean("false") instanceof Object
new Boolean("false") instanceof Boolean
"121" instanceof String				// false		??
false instanceof Boolean				// false		??
"121" instanceof Object				// false		??
false instanceof Object				// false		??

window instanceof Window
window instanceof Object